What is ehrlichiosis?
Ehrlichiosis is a tick-borne disease that can be caused by either of two different organisms. Human
Monocytic Ehrlichiosis (HME) is caused by Ehrlichia chaffeensis, which is transmitted by the lone star
tick (Amblyomma americanum). Human Granulocytic Ehrlichiosis (HGE) is caused by Anaplasma
phagocytophilia, also called anaplasmosis, transmitted by the deer tick (Ixodes scapularis). In New York
state, most cases of ehrlichiosis have been reported on Long Island and in the lower Hudson Valley.
Who gets ehrlichiosis?
Anyone can get ehrlichiosis, although the majority of known cases have been in adults. People who
spend time outdoors in tick-infested areas from April until October are at greatest risk for exposure.
How is ehrlichiosis transmitted?
Ehrlichiosis is transmitted by the bite of infected ticks, including the deer tick and the lone star tick.
Ehrlichiosis cannot be spread from person to person.
What are the symptoms of ehrlichiosis?
The symptoms of HME and HGE are the same and usually include fever, muscle aches, weakness and
headache. Patients may also experience confusion, nausea, vomiting and joint pain. Unlike Lyme
disease or Rocky Mountain spotted fever, a rash is not common. Infection usually produces mild to
moderately severe illness, with high fever and headache, but may occasionally be life-threatening or
When do symptoms appear?
Symptoms appear one to three weeks after the bite of an infected tick. However, not every exposure
results in infection.
What is the treatment for ehrlichiosis?
Tetracycline antibiotics are usually rapidly effective for ehrlichiosis. Because these antibiotics can cause
dental staining in children, physicians should consult an infectious disease expert when treating children.
What can be done to prevent ehrlichiosis?
When in tick-infested habitat - wooded and grassy areas - take special precautions to prevent tick bites,
such as wearing light-colored clothing (for easy tick discovery) and tucking pants into socks and shirt into
pants. Check after every two to three hours of outdoor activity for ticks on clothing or skin. Brush off any
ticks on clothing before skin attachment occurs. A thorough check of body surfaces for attached ticks
should be done at the end of the day. If removal of attached ticks occurs within 36 hours, the risk of
tick-borne infection is minimal.
Repellents can be effective at reducing bites from ticks that can transmit disease. But their use is not
without risk of health effects, especially if repellents are applied in large amounts or improperly.
Repellents commonly available to consumers contain the active ingredients DEET (N,
N-diethyl-m-toluamide), permethrin, or botanical oils. DEET products have been widely used for many
years, but have occasionally been associated with health effects. Skin reactions (particularly at DEET
concentrations of 50 percent and above) and eye irritation are the most frequently reported health
problems. Products containing permethrin are for use on clothing only, not on skin. Rather than acting
as a repellent, permethrin kills ticks and insects that come in contact with treated clothes. Permethrin
can cause eye irritation. Insect repellents containing botanical oils, such as oil of geranium, cedar,
lemongrass, soy or citronella are also available, but there is limited information on their effectiveness and
toxicity. If you decide to use a repellent, use only what and how much you need for your situation.
Use repellents only in small amounts, avoiding unnecessary repeat application. Try to reduce theuse of repellents by dressing in long sleeves and pants tucked into socks or boots.
Children may be at greater risk for reactions to repellents, in part, because their exposure may begreater. Do not apply repellents directly to children. Apply to your own hands and then put it onthe child.
Do not apply near eyes, nose or mouth and use sparingly around ears. Do not apply to thehands of small children.
After returning indoors, wash treated skin with soap and water.
How should a tick be removed?
Grasp the mouthparts with tweezers as close as possible to the attachment (skin) site. Be careful not to
squeeze, crush or puncture the body of the tick, which may contain infectious fluids. After removing the
tick, thoroughly disinfect the bite site and wash hands. See or call a doctor if there are concerns about
incomplete tick removal. Do not attempt to remove ticks by using petroleum jelly, lit cigarettes or other
home remedies because these may actually increase the chance of contracting a tick-borne disease.
How do I obtain information on a tick?
Tick identification services are available through the New York State Department of Health and some
county health departments. The New York State Department of Health Tick Identification Service will tell
you the species of the tick, whether it is engorged with blood and, if so, how long it may have been
feeding. The Tick Identification Service will also report whether the mouthparts are present (if not, they
may have remained in the skin and need to be removed, as you would a splinter). The Tick Identification
Service will not
tell you whether the tick is infected with disease-causing organisms. There is no charge
for this service.
If you wish to have a tick identified, place it in a small jar containing rubbing alcohol, seal the container toprevent leakage and complete the Tick Identification Submittal Form. Mail the tick in the sealedcontainer, along with the completed submittal form, to the New York State Health Department’s TickIdentification Service, c/o HVCC Central Receiving, 80 Vandenburgh Avenue, Troy, NY 12180. Onceyou send a tick to be identified it will not be returned.
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